Withdraw 27 diamond necklaces and a stack of cosmic runes. Click on the spell and use it on the first diamond necklace, then wait until the experience drops from the first one to use the spell on the next necklace. It is inconvenient that the phoenix necklaces look the same as diamond necklaces, thus there is no way to tell which ones are enchanted without seeing their names. Bank after you have enchanted all 27, and repeat the process.

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